Beating engine



R. H. HENRY BETING ENGINE 1 Filed May 13, 1935' June 23, 1936.

M5 A TDR/VSX Patented June 23, 1936 UNITED stares PATENT OFFICE BEATNG ENGXNE Robert E. Henry, Dayton,

Simonds Worden White Company,

Ohio, assigner to Dayton,

4 Ciaims.

This inventio-n relates to a beating engine, or beater, such as is commonly employed in the preparation of pulp for the manufacture of paper or like purposes, and relates more particularly to the bars which form a part ci the beater roll of such an engine.

One object o-f the invention is to provide a beater roll having its bars so constructed as to prevent the same from entrapping air and carrying the same into t -e material which is under treatment.

A further object of the invention is to so construct the beater bars that they will separate from the mass of material, and cause to be expelled therefrom, any air contained in the material or any gas which may have been generated therein, by chemical action or otherwise.

A further object of the invention is to provide a beater bar which, in cooperation with the bed plate, will have an improved action on the material and will increase the length of the fiber.

A further object of the invention is to so construct the beater bar that it will have ample strength and the action thereof on the material will not change as the bar wears away.

Other objects of the invention will appear as the device is described in detail.

In the accompanying drawing Fig. 1 is a longitudinal sectional view of a portion of a beater engine embodying my invention; Fig. 2 is a transverse sectional view of a portion of the beater roll; Fig. 3 is a plan View oi a portion of the beater roll; Fig. 4 is a perspective view oi a beater bar constructed in accordance with my invention; and Fig. 5 is a perspective view of another beater bar forming part of the same beater roll as the bar of Fig. 4.

In the drawing I have illustrated one embodiment of my invention and have shown the same in connection with a beating engine of a well known type but it will be understood that this particular embodiment has been chosen for the purposes of illustration only and that the invention may take various forms and may be used in F connection with beating engines or like machines of various kinds.

' In Fig. 1 I have illustrated a portion of a beating engine of a type to which the invention may be applied. As there shown, the engine comprises a tub Iii, which is usually oblong in shape, and contains a longitudinal partition I I the ends of which are spaced from the respective ends of the tub so as to form within the tub an endless channel. Mounted in this channel, at one side of the partition I I, is a bed plate I2 beyond which (Ci. S12-22) is arranged the usual back fall I3. Rotatably mounted on the tub, above the bed plate I2, is a beater roll I i having a series of beater bars spaced circumierentially about the saine to cooperate with the bed plate. In operation the tub is partially filled with water, usually to a level somewhat below the axis of the beater roll, and the material or stock which is to be reduced to pulp is deposited in this water and iioats therein. The beater roll and bed plate are oi a length substantially equal to the width of that portion of the channel in which they are mounted and as the beater roll rotates it will cause the water and the material therein to circulate through the endless channel and the material will be carried between the beater roll and the bed plate which will shred the saine and will gradually reduce the material to a pulp. When the pulp has been reduced to the desired degree of iinenss it is withdrawn from the tub. The construction and operation of beating engines of this type are well known in the art and it is unnecessary to further illustrate or describe the beating engine as a whole.

The level of the water in the tub being somewhat below the horizontal diameter of the beater roll the outer ends of the bars will enter the Water in advance of the inner portions thereof and if these bars are continuous air will be trapped in the space between the bar and the water and carried into the water where it will mingle with the material. Further, gas is sometimes formed in the mass of material by chemical action or otherwise. If air or gas is contained in the iinished pulp which is delivered to the paper making machine it will cause defects in the paper and therefore it is highly desirable to eliminate all air and gas from the material during the reduction thereof. The beater bar of the present application is of such a character that it will not entrap air and carry the same into the material but will release air or gas contained in the material and cause the same to be expelled therefrom.

For this purpose each beater bar is provided with a plurality of passageways spaced apart lengthwise thereof, andJ preferably in the form of transverse slots, and those portions of the front surface of the bar which are adjacent to the passageways are so shaped as to exert pressure on the material in the direction of the respective passageways, preferably by arranging said portions of the surface at an inclination to the line of movement thereof.- The particular bar here illustrated comprises a plurality of relatively wide sections I5 which extend radially, or transversely to the length of the bar, and are spaced apart relatively short distances lengthwise of the bar and each of these sections constitutes a blade, so that each bar comprises a plurality of blades spaced apart to form narrow passageways between the same. The blades are so shaped that as they pass through the material they will exert lateral pressure thereon and thus force any air or gas contained. in the material toward the lateral edges of the blades and through the spaces or slots between adjacent blades, where it will accumulate in bubbles of sufficient buoyancy to rise to the surface of the mass of material. This is preferably accomplished by so shaping each blade that the lateral portions of the front surface thereof will diverge rearwardly and, in the form here shown, each blade has the cross sectional shape of a broad V, with the apex of the V at the front.

The several blades may be mounted on the body of the beater roll in any suitable manner but to facilitate the mounting and adjustment of the bar as a whole I prefer that the several blades of each bar shall be rigidly connected one to the other and to a single attaching device. As here shown, each bar comprises an inner portion IS which is continuous for the full length of the bar and is adapted to be mounted in a slot in the body of the roll and secured thereto in the usual or any suitable manner, not here shown. The several blades are rigidly secured to this inner portion of the bar and extend radially therefrom and they may, if desired, be formed integral therewith. The blades of each bar are arranged in laterally offset relation to the blades of the next preceding bar so that each blade of each bar will overlap one of the slots or passageways in the preceding bar, as clearly shown in Fig. 3. This laterally offset arrangement of the blades makes it desirable to provide alternate bars with half blades, as shown at il in Figs. 3 and 5. Each half blade has its front surface inclined rearwardly toward the rear edge of the adjacent inclined surface of .fie adjoining V-shaped blade.

As the outer edges of the several blades enter the water during the rotation of the roll any air that is trapped between the blade and the surface of the water will escape through the passageways or slots between the several blades, and the inclined surfaces of the blades insure that all the air will be expelled through these slots and none trapped between the blade and the surface of the water. As the blades move through the mass of material the diverging surfaces of the blades will exert a lateral pressure upon the material and thus force any air or gases contained therein toward the lateral edges of the blades and through the slots and this air or gas will rise to the surface of the water. As a result the finished pulp when discharged from the machine is eiiectively free from air or gas.

Due to the divergence of the lateral portions of the blades the outer edges ci these portions are arranged obliquely to the line of movement of the blade and will engage the material on the bed plate l2 with a shearing action which will more effectively draw the same and will increase the length of the ber. Further, this shape of the blades imparts relatively great strength thereto and enables the blades to be made of substantially uniform thickness throughout their radial length. In beater bars as heretofore constructed it has been customary to gradually thicken the outer or blade portion of the bar from its outer edge toward the body of the roll to secure the necessary strength. As the width of the bar is gradually decreased by wear or grinding the operating edge of the bar increases in thickness, which adversely alects its action on the material. In the present bar the diverging lateral portions of each blade impart ample strength thereto without the necessity of thickening the material of the blade and by making the blades of uniform thickness the action thereof on the material remains the same throughout the life of the blade.

As has been stated, the blades are of substantial width with relation to the length of the bar as a whole and the spaces between the adjacent edges of the blades are narrow. It will be obvious that the size and spacing of the blades may vary under different conditions but I have found that very satisfactory results can be secured with blades approximately six inches in width and passageways or slots approximately one-half inch in width.

While I have shown and described one embodiment of my invention I wish it to be understood that I do not desire to be limited to the details thereof as various modifications may occur to a person skilled in the art.

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A beater bar comprising a straight inner portion to be attached to a roll and a plurality of blades extending outwardly from said inner portion and spaced apart to form slots between adjacent blades, said slots being of narrow width with relation to said blades, and said blades having their front surfaces inclined to the path thereof to exert lateral pressure on the material in a direction lengthwise of said bar and toward said slots.

2. A beater bar comprising a straight inner portion to be attached to a roll and a plurality of blades extending outwardly from said inner portion and spaced apart to form slots between adjacent blades, said slots being of narrow width with relation to said blades, and each blade having the lateral portions of its front surface diverging rearwardly to cause the adjacent surfaces of adjoining blades to converge toward the respective slots.

3. A beater bar comprising a straight inner portion to be attached to a roll and a plurality of blades extending outwardly from said inner portion, each blade being substantially V-shaped in cross section and the adjacent edges of adjoining blades being spaced apart to form between said blades slots which are of narrow width with relation to said blades.

4. A beater roll having a plurality of longitudinal bars spaced about the same, each bar comprising a straight inner portion attached to said roll, and a series of substantially radial blades arranged in line lengthwise of said bar and spaced apart to form slots between adjacent blades, said slots being of narrow width with relation to said blades, each blade being substantially V-shaped in cross section and each blade of each bar having its apex substantially in line with a slot in the adjacent bar to cause the material which passes through a slot in one bar to impinge against the apex of a blade of the following bar.

ROBERT H. HENRY. 

